Question: What is the validity period of Bologna during which it is located in the time zone UTC+02:00?
Paraphrase: When was Bologna part of the UTC+2 time zone?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q1891 p:P421 ?s . ?s ps:P421 wd:Q6723 . ?s pq:P1264 ?value}